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Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

S. Santesson: AUTHOR

Abstract

This document defines a certificate extension for inclusion of Secure/Multipurpose Internet Mail Extensions (S/MIME) Capabilities in X.509 public key certificates, as defined by RFC 3280. This certificate extension provides an optional method to indicate the cryptographic capabilities of an entity as a complement to the S/MIME Capabilities signed attribute in S/MIME messages according to RFC 3851.

Copyright

Copyright (C) The Internet Society (2005).

Country

United States

Language

English (United States)

This text was extracted from an ASCII text file.

This is the abbreviated version, containing approximately
29% of the total text.

This document
specifies an Internet standards track protocol for the
Internet community, and requests
discussion and suggestions for
improvements.
Please refer to the current edition of the "Internet
Official Protocol Standards" (STD
1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.

Copyright Notice

Copyright (C)
The Internet Society (2005).

Abstract

This document
defines a certificate extension for inclusion of
Secure/Multipurpose Internet Mail
Extensions (S/MIME) Capabilities in
X.509 public key certificates, as
defined by RFC 3280. This
certificate extension provides an
optional method to indicate the
cryptographic capabilities of an
entity as a complement to the S/MIME
Capabilities signed attribute in
S/MIME messages according to RFC
3851.

1. Introduction

This document
defines a certificate extension for inclusion of S/MIME
Capabilities in X.509 public key
certificates, as defined by RFC 3280
[RFC3280].

The S/MIME
Capabilities attribute, defined in RFC 3851 [RFC3851], is
defined to indicate cryptographic
capabilities of the sender of a
signed S/MIME message. This information can be used by the recipient
in subsequent S/MIME secured exchanges
to select appropriate
cryptographic properties.

However, S/MIME
does involve also the scenario where, for example, a
sender of an encrypted message has no
prior established knowledge of
the recipient's cryptographic
capabilities through recent S/MIME
exchanges.

In such a case, the sender is forced
to rely on out-of-band means or
its default configuration to select a
content encryption algorithm
for encrypted messages to recipients
with unknown capabilities. Such
default configuration may, however, be
incompatible with the
recipient's capabilities and/or
security policy.

The solution
defined in this specification leverages the fact that
S/MIME encryption requires possession
of the recipient's public key
certificate. This certificate already contains information
about the
recipient's public key and the
cryptographic capabilities of this
key.
Through the extension mechanism defined in th...